First of all 18 count, necessarily doesn't signify any thing major, when your total RBC are normal. In alcoholism it is seen commonly, particularly when you have iron rich alcohol like red wine.
If you have, any symptoms like joint pain, itiching, Headache,
It is quite possible when you stop the underlying cause.
Next Steps
recheck after a month in some other lab. also test your
ferritin and folic acid levels
Health Tips
avoiding dark leafy greens, red meat, dried fruit, legumes, seafood, nuts and seeds, organ meats, and iron-fortified cereals, alcohol with high iron contents as red wine